|(a) The owner shall maintain construction records during construction of a proposed dam or the reconstruction, modification, enlargement, rehabilitation, alteration, or repair of an existing dam, which include: (1) approved construction plans and specifications; (2) approved construction change orders; (3) construction test results as described in subsection (b) of this section; (4) approval letters; and (5) construction inspection reports and other engineering reports that may be developed during construction. (b) The owner shall furnish copies of the construction test results for high- and significant-hazard dams to the executive director for review at least once a month during the construction period to document compliance with the approved plans and specifications and the requirements in this chapter. The test results to be submitted must include, as applicable: (1) soil moisture-density test results; (2) soil dispersion test results; and (3) concrete trial batch design test and compression test results. (c) The owner shall also record, as applicable: (1) final bottom width and elevations of core and cutoff trenches; (2) structural excavations; (3) documentation of permanent sheet piles or bearing piles; and (4) documentation of foundation grouting, de-watering problems, or observations during the construction period of any instruments installed to measure movements, stresses, and pore pressure. (d) The owner shall maintain the construction records as described in subsections (a) - (c) of this section in a secure location at the construction site or at a location designated by the owner that is immediately accessible to the owner until the completion of construction. (e) After completion of construction, the owner shall transfer the construction records in subsections (a) - (c) of this section to a permanent, secure location designated by the owner that is immediately accessible to the owner as described in §299.46 of this title (relating to Records).